Abstract: IN738LC superalloy was fabricated on stainless steel through plasma arc additive manufacturing technology. The effect of processing parameters on microstructure and mechanical property of as-built samples was studied by adjusting peak current, duty cycle and welding speed on the condition of maintaining the same heat input. Optical microscope, scanning electrical microscope, energy dispersive spectrum and microhardness measurements were carried out to analyse the grain structure, precipitations and mechanical properties. In addition, the simulation of solidification process was also performed to illustrate the mechanism of precipitating phases. Results show that microstructure of as-built samples mainly consists of equiaxial dendrites, columnar dendrites and cellular dendrites. There are many particle or needle carbides precipitating in the inter-dendritic regions. γ′ phases will precipitate under low dilution and enhance microhardness remarkably.
1 Xu F J, Lv H Y, Liu Y X, et al. Journal of Materials Engineering, 2012(11), 6(in Chinese). 徐富家, 吕耀辉, 刘玉欣, 等. 材料工程, 2012(11),6. 2 Xu F J, Huang R S, Lei Z, et al. Welding & Joining, 2016(9),43(in Chinese). 徐富家, 黄瑞生, 雷振, 等.焊接, 2016(9),43. 3 Ramakrishnan A, Dinda G P. Materials Science and Engineering A, 2019, 740, 1. 4 Danis Y, Arvieu C, Lacoste E, et al. Materials & Design, 2010, 31(1), 402. 5 Henderson M B, Arrell D, Larsson R, et al. Science and Technology of Welding and Joining, 2004, 9(1), 13. 6 Huang Y. Optics & Laser Technology, 2011, 43(5), 965. 7 Segerstark A, Andersson J, Svensson L E. Optics & Laser Technology, 2017, 97, 144. 8 Wang K B, Lv Y H, Liu Y X, et al. Materials Review B: Research Papers, 2017, 31(7), 100(in Chinese). 王凯博, 吕耀辉, 刘玉欣, 等. 材料导报:研究篇, 2017, 31(7), 100. 9 Zhang Z H, Zhou Y H, Zhou S Y, et al. Metallurgical and Materials Transactions A, 2019, 50(8), 3922. 10 Wang H, Zhang X, Wang G B, et al. Journal of Alloys and Compounds, 2019, 807, 151662. 11 Pan H, Zhao J F, Liu Y L, et al. Chinese Journal of Lasers, 2013, 40(4), 109(in Chinese). 潘浒, 赵剑峰, 刘云雷, 等. 中国激光, 2013, 40(4), 109. 12 Deng D, Peng R L, Brodin H, et al. Materials Science and Engineering: A, 2018, 713, 294. 13 Liu L, Sommer F, Fu H Z. Scripta Materialia, 1994, 30(5), 587. 14 Manikandan S G K, Sivakumar D, Prasad Rao K, et al. Journal of Materials Processing Technology, 2014, 214(12), 3141. 15 El-Bagoury N, Waly M, Nofal A. Materials Science and Engineering: A, 2008, 487(1-2), 152. 16 Segerstark A, Andersson J, Svensson L E, et al. Materials Characterization, 2018, 142, 550. 17 Chen J, Xue L. Materials Science and Engineering: A, 2010, 527(27-28), 7318.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2021, Vol. 35 
